[Collins] Split Mode

[Dr. Gerald N. Johnson]

On Tue, 2006-02-14 at 09:59 -0500, Garey Barrell wrote:
> Henry -
> 
> This was a common problem back in the 60's.  You were transmitting at 
> 14.040 MHz.  The problem is that with the S-Line you have to remove the 
> cables and replace the 100 ohm dummy load in the transmitter to operate 
> split across a bandswitch division.   We used to hear quite a few 
> Collins stations calling a DX station on SSB, down at the bottom of the 
> CW band!  None of the other brands (Drake, Heath, etc.) had the problem, 
> because they had 500 kHz bands.
> 
> 73, Garey - K4OAH
> Atlanta

It isn't necessary to remove ALL the cables. Just the crystal oscillator
cable between transmitter and receiver, and then plug the transmitter
oscillator internal short cable to the transmitter first oscillator
jack. That jack is J7 in the transmitter. Its OK to unhook that cable
from the Jack J1 in the receiver and put in the dummy load but not
absolutely necessary.

That simple change will let you use separate crystals for transmit and
receive and to split any amount. But if you switch to transceive on the
transmitter you probably won't receive and transmit on the same
frequency because of the differences between the crystals even for the
same band segment.

-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer